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CVE-2026-74867— SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth

Quick assessment

Affected
siyuan-note siyuan
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在跨站请求伪造漏洞，该漏洞源于CheckAuth()的会话cookie身份验证分支缺少Origin/Referer验证且未设置显式SameSite属性，可能导致跨站请求伪造攻击，攻击者可构造恶意网页利用有效会话cookie代表已认证用户执行未经授权的操作。

CVSS 4.2 · Medium EPSS 0.13% · P2

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
siyuan-note siyuan < 3.7.4 affected
3.7.4 unaffected
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I. Basic Information for CVE-2026-74867

Vulnerability Information
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Vulnerability Title
SiYuan before 3.7.4 Cross-Site Request Forgery via CheckAuth
Source: CVE Program / CVE List V5
Vulnerability Description
SiYuan versions before 3.7.4 contain a cross-site request forgery vulnerability in the session-cookie authentication branch of CheckAuth() that lacks Origin/Referer validation and sets no explicit SameSite attribute on session cookies. Attackers can craft malicious web pages that perform unauthorized actions on behalf of authenticated users by submitting requests with valid session cookies, relying on browser default SameSite policies rather than server-enforced protections.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨站请求伪造(CSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
SiYuan 跨站请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
SiYuan是SiYuan团队开源的一款文档管理软件。 SiYuan 3.7.4之前版本存在跨站请求伪造漏洞，该漏洞源于CheckAuth()的会话cookie身份验证分支缺少Origin/Referer验证且未设置显式SameSite属性，可能导致跨站请求伪造攻击，攻击者可构造恶意网页利用有效会话cookie代表已认证用户执行未经授权的操作。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
siyuan-note siyuan 0 ~ 3.7.4 -

II. Public POCs for CVE-2026-74867

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III. Intelligence Information for CVE-2026-74867

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Vendor Advisories for CVE-2026-74867 (2)

Same Patch Batch · siyuan-note · 2026-08-17 · 7 CVEs total

CVE-2026-74799 9.3 CRITICAL SiYuan before 3.7.4 Unauthenticated Debug Endpoint Information Disclosure
CVE-2026-74800 9.0 CRITICAL SiYuan before v3.7.4 Stored XSS via assets endpoint
CVE-2026-74798 8.7 HIGH SiYuan kernel Path Traversal via database_clean MCP tool
CVE-2026-74801 8.2 HIGH SiYuan before 3.7.4 Local Privilege Escalation via elevator.exe
CVE-2026-74802 8.2 HIGH SiYuan 3.7.3 Cross-Site WebSocket Hijacking via network proxy
CVE-2026-74868 7.5 HIGH SiYuan before 3.7.4 Brute-Force Authentication via Publish Service

IV. Related Vulnerabilities

Same product: siyuan
Same vendor: siyuan-note
Same weakness: CWE-352

V. Comments for CVE-2026-74867

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